package cn.tedu._03vehicle.base.filters;

import cn.tedu._03vehicle.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.validation.constraints.Null;
import java.io.IOException;

@Slf4j
@WebFilter(filterName="loginCheckFilter",urlPatterns = {"/v1/vehicle/*"})
public class LoginCheckFilter implements Filter {
    /*过滤的初始化方法*/
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.debug("过滤器初始化方法");
    }
   /*核心的过滤方法，每次请求都会调用次方法*/
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.debug("进入登录状态校验的过滤器");
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取会话
        HttpSession session = request.getSession();
        //获取会话标识
        UserVO userVO = (UserVO) session.getAttribute("user");
        if(userVO!= null){
            //有此行代码，代表放行；
            //无此行代码，代表拦截
            filterChain.doFilter(request,response);
        }
        response.sendRedirect("/login.html");
        //因为无filterChain.doFilter(request,response),代表拦截
    }
/*过滤器销毁方法，服务关闭时调用一次*/
    @Override
    public void destroy() {
        log.debug("过滤器销毁方法");
    }
}
